<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <div>
        <!-- 添加按钮 -->
        <el-row>
          <el-col>
            <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
          </el-col>
        </el-row>
        <!-- 表格 -->
        <tree-table :data="cateList" :columns="columns" border show-index :selection-type="false" :expand-type="false" :show-row-hover="false">
          <!-- 是否有效 -->
          <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color:lightgreen"></i>
            <i class="el-icon-error" v-else style="color:red"></i>
          </template>
          <!-- 排序 -->
          <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag size="mini" v-if="scope.row.cat_level===1" type="success">二级</el-tag>
            <el-tag size="mini" v-if="scope.row.cat_level===2" type="warning">三级</el-tag>
          </template>
          <template slot="opt">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
          </template>
        </tree-table>
        <!-- 分页区域 -->
        <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3, 5, 10,15]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
        </el-pagination>
      </div>
    </el-card>

    <!-- 添加对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClose">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>

        <el-form-item label="父级分类：">
          <!-- 级联选择器 -->
          <el-cascader clearable v-model="selectedKeys" :options="parentCateList" :props="{checkStrictly:true, expandTrigger: 'hover' ,...cascaderProps}" @change="parentCateChange"></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类列表
      cateList: [],
      //父级分类列表
      parentCateList: [],
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          prop: "cat_deleted",
          type: "template",
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      total: 0,
      addCateDialogVisible: false,
      //添加分类的表单数据
      addCateForm: {
        cat_pid: 0,
        cat_name: "",
        cat_level: 0,
      },
      //级联选择器配置对象
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //选中的父级分类的id数组
      selectedKeys: [],
      //添加分类表单验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data } = await this.$http.get(`categories`, {
        params: this.queryInfo,
      });
      if (data.meta.status != 200) {
        return this.$message.error("获取商品列表失败");
      }
      this.cateList = data.data.result;
      this.total = data.data.total;
    },
    //监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    //监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    //打开添加对话框
    showAddCateDialog() {
      //先获取父级分类
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    //获取父级分类列表
    async getParentCateList() {
      const { data } = await this.$http.get(`categories`, {
        params: { type: 2 },
      });
      if (data.meta.status !== 200) {
        return this.$message.error("获取父级分类失败");
      }
      this.parentCateList = data.data;
    },
    parentCateChange() {
      if (this.selectedKeys.length > 0) {
        //父级分类id
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1];
        this.addCateForm.cat_level = this.selectedKeys.length;
      } else {
        this.addCateForm.cat_pid = 0;
        this.addCateForm.cat_level = 0;
      }
    },
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data } = await this.$http.post(`categories`, this.addCateForm);
        if (data.meta.status != 201) {
          return this.$message.error("添加分类失败");
        }
        this.$message.success("添加分类成功");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    addCateDialogClose() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },
  },
};
</script>

<style lang="less" scope>
.el-cascader {
  width: 100%;
}
</style>